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+86 13143444311
Email：sst@szsst88.com
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Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Cross Recessed Pan Head Machine Screw, Phillips Drive, Half Thread (Non-Standard)
Materials:Carbon Steel
Surface treatment:Nickel Plated (bright)
Head Type:Pan Head (low dome, flat annular bearing face, small fillet into the shank)
Drive:Phillips cross recess (four tapered wings, pointed centre; no slot)
Shank:Plain unthreaded shank, about two thirds of the length under the head
Thread:Machine thread, rolled 60 degree, on the tip section only
Point:Blunt end with a small chamfer; no taper, no drill point
Forming:Single-die heading, thread rolling, nickel plating, sorting
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:717
We manufacture cross recessed pan head machine screws in carbon steel with a bright nickel finish, half thread and a plain shank over about two thirds of the length, quoted from M1 to M14. Head dimensions, thread start, length and plating are taken from your drawing.
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ISO 9001:2015 · Manufacturing since 1998 · 8,678+ customers · 89 countries and regions
Made to order – there is no stock catalogue. Each part is produced to your drawing, and production starts after drawing review and first-article approval.
A cross recessed pan head machine screw is a machine screw with a Phillips cross in a low domed head, a machine thread that engages a tapped hole or a nut, and a blunt point. The recorded item on this page is a half-thread version in carbon steel with a bright nickel finish, a plain shank over roughly two thirds of the length, quoted from M1 to M14 with Number 717.
Cross recess. Four tapered wings that meet at a pointed centre. The bit centres itself as it enters, and the wings are shaped so that the driver cams out before it can tear the head apart — the recess is designed to give way before the screw does.
Pan head. A low dome on a flat annular bearing face, with a small fillet into the shank. The flat ring is the working surface and the dome keeps the head low enough to sit under a cover.
Half thread. The thread is rolled on the tip section only; the rest of the shank is plain. That plain shank is not waste: it is the part that fits the clearance hole and lets the clamped component sit square, turn or slide without being threaded onto the screw.
Nickel plating. A bright, hard deposit on carbon steel. It protects the part and gives a silver finish close to stainless, which is why it is used on visible fasteners in equipment and instruments.
The page’s categories record this screw as a JIS part, and the head dimensions follow that standard rather than ISO. Where a drawing also quotes an ISO or DIN head, the two are compared before tooling, because a JIS pan head and an ISO pan head are not identical for every size.
The body is carbon steel wire, with grade and heat number on the batch record. The head is upset in a single heading stroke that forms the dome, the bearing ring and the fillet together, and the cross recess is formed in the same stroke so that the recess and the shank stay concentric.
The cross recess has a depth that is set against the head height. A recess that is too shallow leaves the bit standing proud and the wings do not seat; one that is too deep thins the material under the head and the head deforms under torque. On the small sizes the two are within a few tenths of a millimetre of each other, so both come off the same die and are checked together.
The plain shank is formed by leaving that section out of the thread rolls. Its diameter is the nominal diameter of the screw, not the blank diameter, and it is checked with a micrometer because a plain shank that is undersized lets the clamped part rock on the thread instead of on the shank.
The thread is rolled on the tip section. Rolling keeps the grain continuous and gives a clean flank, and because the thread is short, the transition from plain shank to first thread is a visible line on the part — the thread start. That line is what decides how deep the screw sits in the joint.
Nickel is applied after the thread is rolled. It adds a few microns to the flanks and to the recess, so the thread is gauged in its plated condition and the recess is driven with the customer’s bit after plating rather than before.
The family is quoted from M1 to M14, with M1, M2, M3, M4, M5, M6, M7, M8, M9, M10 and M14 in the recorded range. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. On a half-thread cross recessed pan head machine screw the length is not enough on its own: the plain shank and the thread length have to be quoted with it.
| Item | How it is defined | What we control |
|---|---|---|
| Thread | Metric machine thread, coarse pitch for the size | Gauged per batch after plating |
| Head | Pan head, low dome on a flat bearing ring | Diameter, height and fillet on the projector |
| Recess | Phillips cross, sized to the thread | Depth checked with the customer’s bit |
| Plain shank | Nominal diameter, unthreaded | Diameter checked with a micrometer |
| Thread length | From the thread start to the tip | Measured against the drawing on the first article |
| Length | From under the head to the tip | Measured on the shop plate |
| Standard | JIS head form as recorded on this page | Compared with the drawing before tooling |
Length is measured from under the head and the thread length is measured from the tip. The plain shank is the difference between the two, and on this part it is about two thirds of the length. If a drawing gives only the overall length, the thread length is agreed before tooling; if it gives only the thread length, the same applies in reverse.
The JIS head form is worth a note because it is where drawings from different regions disagree. A JIS pan head is not identical to an ISO pan head at every size, and a screw that measures correctly against one standard can be out on head diameter against the other. The drawing states which one applies, and the first article is measured against that.
On a half-thread cross recessed pan head machine screw the plain shank is the feature that decides the joint, and it is the one most often left off a drawing. It has three jobs, and they are different jobs.
| Job of the plain shank | What it does in the joint | What goes wrong without it |
|---|---|---|
| Clearance fit | The clamped part sits on the shank, not on the thread | The thread cuts into the clearance hole and the part binds |
| Shoulder | The part turns on a smooth surface | The part rides on thread crests and wears or wobbles |
| Thread protection | Wear happens on plain steel, not on the thread | The thread wears in service and the joint loosens |
The clearance fit is the one that matters most in assembly. If the thread runs too far up the shank, it will bite the clearance hole in the top plate and the screw will clamp the wrong member, or jam before the head seats. The thread start is therefore a controlled dimension, not a by-product of the rolls.
The shoulder job shows up in anything that pivots. A lever, a latch or a hinge plate that turns on the screw needs a smooth, round surface at the nominal diameter; a full-thread screw gives it a surface of thread crests, which wears the bore and lets the part wobble after a few hundred cycles.
The cross recess is the third variable. Phillips bits are sized by number, and the wrong number either does not seat or seats too deep: a PH2 in a PH3 recess will cam out early, and a PH3 in a PH2 recess will not reach the bottom. The first article is driven with the bit the customer uses, at the joint torque, and the wings are inspected afterwards.
This screw is bright nickel plated. Nickel is a hard, decorative deposit that protects carbon steel and takes a polish, and it is the usual choice where a small plated screw is seen on an instrument or an appliance rather than buried in a joint.
| Finish | How it protects | Effect on thread and recess | Typical use |
|---|---|---|---|
| Bright nickel | Hard metallic deposit, decorative | A few microns; thread and recess gauged after | Visible instrument and appliance screws |
| White zinc | Sacrificial zinc, blue-white passivation | Thin; thread gauged after | Indoor general assembly |
| Zinc nickel | Alloy layer, higher corrosion resistance | Thicker; thread re-checked | Wet or industrial service |
| Black oxide | Thin conversion coat, lightly oiled | Almost no dimensional change | Black instrument hardware |
| Stainless (equivalent part) | Alloy provides protection | No coating | Wash-down and outdoor work |
Nickel thickness matters on a small screw more than on a large one. At M2 or M3 the deposit is a meaningful fraction of the thread flank, and a heavy deposit will make a GO gauge tight and a light one will leave the thread under size. Plating thickness is agreed on the drawing and the thread is gauged after plating, which is the only condition the customer ever sees.
The recess collects nickel at its corners. That is why the first article is driven after plating: a recess that looks correct can still be a fraction shallow, and a bit that does not bottom will cam out at a lower torque than the drawing assumes.
Three joints where the plain shank does work the thread cannot:
| Where it sits | The screw passes through a clearance hole in a lever or a plate and threads into a fixed member behind it, so the plate turns or slides on the plain shank. |
| When it goes wrong | A full thread scores the bore and the part wobbles after a few hundred cycles, and a thread that starts too early clamps the moving plate. |
| Why it happens | The joint moves, the clearance hole is a close fit, and the screw is visible on the instrument face. |
| What we control | Thread start, shank diameter and head height checked on the first article. |
| Where it sits | The screw fixes a bracket or a terminal block where the plain shank passes through a clearance hole and the thread engages only the lower member. |
| When it goes wrong | A thread running up into the clearance hole grips the bracket and holds it off its seat, and a plated head that is too tall fouls a cover. |
| Why it happens | The assembly is plated steel, the clearance hole is in a thin bracket, and the joint is made on a line. |
| What we control | Shank and thread lengths measured, thread gauged after plating, and the recess driven with the production bit. |
| Where it sits | The screw holds a latch, a stay or a hinge plate that has to pivot on the shank rather than on a thread. |
| When it goes wrong | A threaded shank wears the pivot bore and the fitting develops play, and a head that is too small dished into a thin plate. |
| Why it happens | The part moves in service, the plate is thin, and the fixing is seen. |
| What we control | Shank diameter and head diameter checked, and the thread start kept clear of the moving plate. |
Four reasons that matter on a half-thread screw, each tied to what the drawing has to prove:
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Thread start fixed before tooling
The overall length, the plain shank and the thread length are reviewed together, so the thread start is placed before the rolls are set rather than found afterwards. Basis: Thread start agreed before the rolls are set. |
Head, recess and thread in one route
The pan head, the cross recess and the fillet are formed in one stroke, then the thread is rolled on the tip section on the same machine. Basis: One route from wire to plated screw. |
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Shank and recess checked on the part
The plain shank is measured with a micrometer, the thread is gauged after plating, and the first article is driven with the production bit. Basis: First article driven with the production bit. |
First article to repeat production
The drawing revision, wire heat, die set and thread roll are set at the first article and kept as the reference for later batches. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these cross recessed pan head machine screws on a single-die header that upsets the pan head and the cross recess in one stroke, then rolls the machine thread on the tip section, leaving the plain shank unthreaded. The parts are nickel plated. The first part of every run is measured on the head, the shank and the thread start, and driven with the production bit, before the batch continues.
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The thread roll is what sets the length of the plain shank. The rolls are trimmed to the thread length on the drawing, and changing that length means changing the rolls, so it is done at the start of a run rather than adjusted while it runs. The plated thread is then gauged, because the plating is part of the final dimension.
What decides whether a cross recessed pan head machine screw passes is the head, the recess, the plain shank, the thread start, the thread and the plating. The inspection agreement covers those, and the criteria come from the drawing.
Head and shank on the projector |
Thread gauged after plating |
Hardness testing against the property class |
Salt-spray testing of the plated part |
The thread start is checked by measurement rather than by eye, because it is a position on the shank and not a feature that can be seen against a profile. On the first article it is measured from the tip and cross-checked against the plain shank length, so that the two numbers add up to the overall length.
The recess is checked by driving at the joint torque with the production bit, then inspecting the wings for deformation. A cross recess that is correct on the gauge but shallow after plating will show as a polish mark on the wing edges rather than as a stripped head, and that mark is what the inspection looks for.
Every shipment of cross recessed pan head machine screws is traceable to the wire it was made from. The grade and heat number are recorded on the material certificate supplied with the parts, and the inspection records follow the criteria agreed on the drawing.
ISO 9001:2015 |
RoHS test report |
Registered trademark |
Patent: security screw and driver |
With each batch we supply the material certificate, the inspection record for the criteria on the drawing and, where it is listed, the third-party report for the material or the plating. The documents carry the drawing revision and the batch number, so the paperwork can be matched to the parts.
More than 8,678 customers in 89 countries and regions have ordered from Shi Shi Tong; 87% of orders come from repeat customers and 56% through referrals. Most projects follow the same route: drawing review, first-article approval, then batches checked against that sample. On a half-thread screw the first article is assembled into the real joint, because the thread start only proves itself against the clearance hole it has to clear. Buyers visit during the process to review samples and to see how the heads and recesses are formed.
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8,678+
customers served
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87%
of orders from repeat customers
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56%
of orders through referrals
|
89
countries and regions shipped to
|
Buyers and quality engineers visit for sample review, process discussion and supplier audits; the visit is arranged around production so the header and the plating line can be seen on the day the parts run.
Customer group visit – sample review |
Customer group visit – process discussion |
Customer group visit – factory tour |
Customer visit – project kick-off |
Danish customer – drawing review |
Industry exhibition – meeting customers |
It is a machine screw with a Phillips cross in a low domed head and a machine thread for a tapped hole or a nut. This one is half thread, so most of the shank is plain.
The plain shank fits the clearance hole, so the clamped part sits square, turns or slides on smooth steel instead of on thread crests.
The line where the plain shank becomes thread. It decides how deep the screw sits in the joint, and if the thread runs too far up it will grip the clearance plate.
A Phillips bit of the right number: PH1 for the small sizes and PH2 from M5 up on most parts. The wrong number either will not seat or cams out early.
Not for every size. The head diameter and height are set by the standard, so the drawing states which one applies and the first article is measured against it.
Thread size and pitch, head diameter and height, recess size, overall length, thread length, the standard, material and property class, and the plating thickness.
How a cross recessed pan head machine screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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→ |
2
Shank and thread start review
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→ |
3
First article driven in the joint
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→ |
4
Batch production and repeat orders
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Each step is confirmed with you before the next one starts; the drawing revision from the first article is what repeat orders are checked against.
For a quotation, send the drawing with the thread size and pitch, head diameter and height, recess size, overall length, thread length, the standard that applies, material and property class, and plating thickness.
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Thread size and pitch
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Head diameter and height
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Recess size
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Overall length
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Thread length
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Standard and plating
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Sending a drawing? The form below does not take attachments. Email the PDF, DXF or STEP file to sst@szsst88.com with the part name and quantity in the subject line – the drawing is reviewed and a quotation follows.
+86 13143444311
sst@szsst88.com
